#include <stdio.h>
#include <math.h>
#define NUM 320
int number[NUM];
void main()
{
    int i,j,count=0;
    printf("There are following primes sequences in first row:\n");
    for(j=0,i=3;i<=1993;i+=2)
        if(fflag(i))number[j++]=i;
        for(j--;number[j]>1998;j--){
            for(i=0;number[j]-number[i]>1898;i++);
            if(number[j]-number[i]==1898)
            printf(" (%d).%3d,......,%d\n",++count,number[i],number[j]);
        }
}
fflag(i)
int i;
{
    int j;
    if(i<=1)return(0);
    if(i==2)return(1);
    if(! (i%2))return(0);
    for(j=3;j<=(int)(sqrt((double)i)+1);j+=2)
    if(! (i%j))return(0);
    return(1);
}